Asus Transformer 3 Pro T303UA - Manual (Page 22)

22 ASUS Tablet and ASUS Keyboard Dock E-Manual
ASUS Pen (on selected models)
Inserting the battery
Configurable buttons
You can configure these buttons to enable the eraser and right-
click functions.
1. Remove the top half of the stylus.
2. Insert the battery, noting the correct polarity.
3. Return the top half of the stylus into place.